att.dimensions gives the plural 'chars' and 'lines' as suggested values of @unit. But the guidelines use the singular 'char' in the examples for <space>. The examples for <gap>, <dim>, <precision>, and <del> use plural 'chars'. att.measurement gives singular 'kBit' as a suggested value for @unit. Suggested values in <milestone> and <refState> are singular.
Should these be made consistent? At minimum, the guidelines for <space> should match the sample values in att.dimensions.